The enthalpy of formation for `C_(2)H_(4)(g),CO_(2)(g)` and `H_(2)O(l)` at `25^(@)C` and 1 atm. Pressure are 52, -394 and -286 KJ `mol^(-1)` respectively. The entahlpy of combustion of `C_(2)H_(4)` will be :-A. `+1412 "KJ mole"^(-1)`B. `-1412 "KJ mole"^(-1)`C. `+142.2 "KJ mole"^(-1)`D. `-141.2 "KJ mole"^(-1)`

The enthalpy of formation for `C_(2)H_(4)(g),CO_(2)(g)` and `H_(2)O(l)

1.	The enthalpy of formation for `C_(2)H_(4)(g),CO_(2)(g)` and `H_(2)O(l)` at `25^(@)C` and 1 atm. Pressure are 52, -394 and -286 KJ `mol^(-1)` respectively. The entahlpy of combustion of `C_(2)H_(4)` will be :-A. `+1412 "KJ mole"^(-1)`B. `-1412 "KJ mole"^(-1)`C. `+142.2 "KJ mole"^(-1)`D. `-141.2 "KJ mole"^(-1)`
Answer» Correct Answer - B `C_(2)H_(2(g))+3O_(2(g))rarr 2CO_(2(g))+2H_(2)O_((l)) , Delta H_("Comb.") = ?` `Delta H = S?igma (Delta H_(f))_(P)-Sigma (Delta H_(f))_(R )`

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